The story behind BMW's unique quad-turbo diesel engine, its impressive performance, and how it stacked up against its rivals ...

BMW manufactures internal combustion vehicles, motorcycles, and hybrid vehicles all around the world. That's a lot of different engines to think about.

Daud Gonzalez is a lifelong car enthusiast and automotive writer with a specialty in modified and race-ready rides. He spends most of his time modifying his cars and ruining them in the process. He is ...